Vaughn didn't offer specifics, but he likely will start former 76er Nikola Vucevic at center in place of Ayón.

Arron Afflalo probably will not play against the Sixers. Afflalo has a strained left hamstring that has bothered him on-and-off for weeks, and team officials and Afflalo want the muscle to heal before Afflalo returns to game action.

Magic sign a wing

With Afflalo and fellow wing Christian Eyenga nursing hamstring strains, the Magic on Tuesday signed 6-foot-6 wing Chris Johnson to give the team another healthy body this preseason.

Johnson was born in Orlando and moved to Ohio at the age of 14.

He played four seasons at the University of Dayton, where he averaged 12.4 points and 6.4 rebounds per game as a senior. The Los Angeles Clippers invited him to training camp but waived him a couple of days ago.

Magic officials liked Johnson during the draft scouting process, but his chances of making the Magic's regular-season roster seem remote.

Johnson's signing might be a tacit admission that Afflalo will be out of action beyond Thursday's exhibition.

The Magic now have 20 players on their roster.

The NBA's regular-season roster limit is 15 players — and that even includes players who are assigned to the D-League.

"Cutting anyone is always hard," Vaughn said. "Everyone has a, you can actually say, dream to play in the NBA. So it'll be difficult for us to get down to 15. At the same time, all those guys know that's just a part of the numbers game."

Singing 'Baby'

Last season, the Amway Center loudspeakers often played music that featured the word "baby" in it whenever Glen "Big Baby" Davis made a big play or scored a point. Davis loved it.

On Tuesday, he revealed that he has a different tune in mind for those situations this season.

Davis recently recorded a song called "Big Baby Gon' Turn It Up," and it's kind of catchy. It features his voice, with some significant enhancements provided by Auto-Tune.

"He plays with a motor, for sure," Vaughn said. "He's gritty. That's kind of his background. He's a hard-nosed guy, and that's what he's going to have to do in this league: play extremely hard every single night. He's got to try to outwork his guy, just plain and simple. He's got to beat him down the floor every single time. He's got to be in the right position on the pick-and-roll every single time. That'll get Kyle O'Quinn in the game."

Layups

•The Magic scrimmaged for part of their practice Tuesday.

•The team is scheduled to practice today at Amway Center.

•Johnson will wear No. 24 on his Magic jersey.

jbrobbins@tribune.com. Read his blog at OrlandoSentinel.com/magicblog and follow him on Twitter at @JoshuaBRobbins.